![[tokkee]](http://tokkee.org/images/avatar.png){kind=avatar}
diff --git a/src/wireless.c b/src/wireless.c
--- /dev/null
+++ b/src/wireless.c
@@ -0,0 +1,173 @@
+/**
+ * collectd - src/wireless.c
+ * Copyright (C) 2006,2007 Florian octo Forster
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ * Florian octo Forster <octo at collectd.org>
+ **/
+
+#include "collectd.h"
+#include "common.h"
+#include "plugin.h"
+
+#if !KERNEL_LINUX
+# error "No applicable input method."
+#endif
+
+#define WIRELESS_PROC_FILE "/proc/net/wireless"
+
+#if 0
+static double wireless_dbm_to_watt (double dbm)
+{
+ double watt;
+
+ /*
+ * dbm = 10 * log_{10} (1000 * power / W)
+ * power = 10^(dbm/10) * W/1000
+ */
+
+ watt = pow (10.0, (dbm / 10.0)) / 1000.0;
+
+ return (watt);
+}
+#endif
+
+static void wireless_submit (const char *plugin_instance, const char *type,
+ double value)
+{
+ value_t values[1];
+ value_list_t vl = VALUE_LIST_INIT;
+
+ values[0].gauge = value;
+
+ vl.values = values;
+ vl.values_len = 1;
+ sstrncpy (vl.host, hostname_g, sizeof (vl.host));
+ sstrncpy (vl.plugin, "wireless", sizeof (vl.plugin));
+ sstrncpy (vl.plugin_instance, plugin_instance,
+ sizeof (vl.plugin_instance));
+ sstrncpy (vl.type, type, sizeof (vl.type));
+
+ plugin_dispatch_values (&vl);
+} /* void wireless_submit */
+
+#define POWER_MIN -90.0
+#define POWER_MAX -50.0
+static double wireless_percent_to_power (double quality)
+{
+ assert ((quality >= 0.0) && (quality <= 100.0));
+
+ return ((quality * (POWER_MAX - POWER_MIN)) + POWER_MIN);
+} /* double wireless_percent_to_power */
+
+static int wireless_read (void)
+{
+#ifdef KERNEL_LINUX
+ FILE *fh;
+ char buffer[1024];
+
+ char *device;
+ double quality;
+ double power;
+ double noise;
+
+ char *fields[8];
+ int numfields;
+
+ int devices_found;
+ int len;
+
+ /* there are a variety of names for the wireless device */
+ if ((fh = fopen (WIRELESS_PROC_FILE, "r")) == NULL)
+ {
+ char errbuf[1024];
+ WARNING ("wireless: fopen: %s",
+ sstrerror (errno, errbuf, sizeof (errbuf)));
+ return (-1);
+ }
+
+ devices_found = 0;
+ while (fgets (buffer, sizeof (buffer), fh) != NULL)
+ {
+ char *endptr;
+
+ numfields = strsplit (buffer, fields, 8);
+
+ if (numfields < 5)
+ continue;
+
+ len = strlen (fields[0]) - 1;
+ if (len < 1)
+ continue;
+ if (fields[0][len] != ':')
+ continue;
+ fields[0][len] = '\0';
+
+ device = fields[0];
+
+ quality = strtod (fields[2], &endptr);
+ if (fields[2] == endptr)
+ quality = -1.0; /* invalid */
+
+ /* power [dBm] < 0.0 */
+ power = strtod (fields[3], &endptr);
+ if (fields[3] == endptr)
+ power = 1.0; /* invalid */
+ else if ((power >= 0.0) && (power <= 100.0))
+ power = wireless_percent_to_power (power);
+ else if ((power > 100.0) && (power <= 256.0))
+ power = power - 256.0;
+ else if (power > 0.0)
+ power = 1.0; /* invalid */
+
+ /* noise [dBm] < 0.0 */
+ noise = strtod (fields[4], &endptr);
+ if (fields[4] == endptr)
+ noise = 1.0; /* invalid */
+ else if ((noise >= 0.0) && (noise <= 100.0))
+ noise = wireless_percent_to_power (noise);
+ else if ((noise > 100.0) && (noise <= 256.0))
+ noise = noise - 256.0;
+ else if (noise > 0.0)
+ noise = 1.0; /* invalid */
+
+ wireless_submit (device, "signal_quality", quality);
+ wireless_submit (device, "signal_power", power);
+ wireless_submit (device, "signal_noise", noise);
+
+ devices_found++;
+ }
+
+ fclose (fh);
+
+ /* If no wireless devices are present return an error, so the plugin
+ * code delays our read function. */
+ if (devices_found == 0)
+ return (-1);
+#endif /* KERNEL_LINUX */
+
+ return (0);
+} /* int wireless_read */
+
+void module_register (void)
+{
+ plugin_register_read ("wireless", wireless_read);
+} /* void module_register */